public class Test_BinarySearchTree {
    public static void main(String[] args) {
        BinarySearchTree binarySearchTree = new BinarySearchTree();
        binarySearchTree.insert(12);
        binarySearchTree.insert(21);
        binarySearchTree.insert(5);
        binarySearchTree.insert(18);
        binarySearchTree.insert(9);

        binarySearchTree.remove(18);
        binarySearchTree.inorder(binarySearchTree.root);

    }
}
